Grinding and polishing machine.



W. F. OROURKE.

GRINDING AND POLISHING MACHINE. APPLICATION mit; APR. s, 1914.

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GRINDING ANI) IPOLISI-IIG- MACHINE.

Specification of Letters Patent.

Patented July 13, 1915.

Application led April 6, 1914. Serial No. 829,737.4

To all whom t may concern Be it known that I, WILLIAM F. OROURKE, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvementin Grinding and Polishingv Machines, of which the following is a full, clear, concise, and exact description.

My'invention relates to grinding and polishing machines or the like. In such machines it is customary to have polishing or grinding wheels secured upon opposite ends of a driving shaft, and the driving shaft is stopped, thereby stopping the operation of both wheels, whenever it becomes necessary to repair or render `true either ofv said wheels.

The object of my-invention isto provide a grinding or polishing machine in which, without stopping the rotation of the shaft, either wheel can be independently disengaged therefrom or thrown into engagement therewith, whereby one wheel can be stopped for repairs without disturbing the operation of the other.

My invention will be more fully understood by reference to the accompanying drawing, in which- Figure 1 is a longitudinal sectional view of a machine embodying my invention, the clutch at the left-hand side being shown in engagement with the spindle of a grinding wheel and the clutch at the right hand side being in a disengaged position; Fig. 2 is a vertical sectional view on the line 2-2 of Fig. 1; and Fig. 3 is a fragmentary view in elevation showing the cam for engaging and disengaging the clutch.

Similar letters of reference refer to similar parts throughout the several figures.

In Fig. 1, I have shown a constantly driven shaft journaled in stationary' bearings 2, 2, said shaft 1 being held against longitudinal movement by threaded collars 3, 3, screwed to the outer ends thereof and bearing against the internal flanges 4, 4, of the bearings 2. In the bearings 2 I have secured the ball-bearings 5, 5, the outer ring of which is secured against rotation by means of the set-screews 6, 6, the inner member 5 thereof being securedto the shaft 1. Within the shaft 1 are slidably mounted sleeves 7, 7 held against rotation by pins 8, 8 which connect thrust-collars 9, 9 slidably mounted on the shaft 1, with the sleeves 7. The shaft 1 is slotted at 10 to allow this thrust-collar 9. Centrally located between the inner ends of the slidable sleeves 7 is a spring 11 which tends to hold the sleeve 7 in an engaged position with the split jaw clamping members 12, 12. A driving pulley 13 is secured to the shaft 1 in any suitable p manner, for example, by a set-screw 14.

The bearings 2, 2 have their inner ends slightly enlarged and recessed to overlie the periphery of the driving pulley and in this way. form a partial housing for the same. rI`his housing is cut away to form a cam 1G with which the handle or lever 15 coperates. Said handle will ride against said cam surface and allow the spring 11 to carry the sleeve 7 into engagement with the enlarged end of the spring clamping member 12, causing said clamping member to clutch the end of the spindle 17 ofthe grinding or polishing wheel 17. While the drawings show the wheel 'atthe left hand end ofthe machine, it will be understood that another wheel is at the opposite end of the machine, the opposite ends of the machine being duplicates of each other.

The handle 15 is secured to a collar 18 which is slidably mounted upon the shaft 1, the collar 9 being held against said collar 18 by the spring 11. rIhe disengagement of the spindle 17 from the split jaw clamp 12 is effected as follows The operator grasps the handle 15 and turns it to the p0- sition shown in Fig. 3 and at the right hand l end of Fig. 1, at which time the collar 9 and the corresponding sleeve 7 is pressed inward, compressing the spring 11. By such movement of the sleeve 11 the jaws of the clamping member 12 are allowed to open sufliciently to clear the threads on the end of the spindle 17. The handle 19 is neXt turned, causing the disk 20, which is formed eccentrically onthe plug 21, to move a slidable member 22 outward, thus disengaging the spindle 17 from the clamping jaw. To rengage the spindle, the operation would be reversed. rIhe handle 19 would be turned to thrust the threaded end of the spindle 17 within the end of the split clamping member 12, and the lever 15 would be moved to its other position, thereby permitting the 4spring 11 to cause the sleeve 7 to be thrust against the shoulder on the spring clamping the end of the shaft l, each have a tapered aperture which engages a correspondingly tapered portion of the spindle. This limits the inward movement of the spindle 17 and acts as a locking device by causing the split clamping jaws to be drawn, through the iction of the screw-threads, toward the col- Mounted in the bearing 23 attached to the frame of the machine is the mechanism which shifts the spindle into and out of position for engagement wth the clutch, as has been hereinbefore described. v Upon one end of the slide 22 is mounted a housing 24 in which is secured a ball-bearing 25, the inner member 26 being secured to the spindle 17. At the opposite end of the slides 22 is a housing 27 to which is secured a ballbearing 28, the inner member 29 of which is secured to spindle 17. These housings 24: and 27 effectually seal the ball-bearings to the admission of fine particles of dust and emery such aswould be liable to otherwise lodge in them.

Ido not wish to be understood as limiting .myself toa machine having the particular structure of clutch mechanism shown and described, and .I am aware that similar clutches have been applied to spinning lathes.

What I claim is 1. In a grinding and polishing machine,

Copies of this patent may be obtained for the combination of a constantly driven shaft, bearingsv supporting the opposite ends of said shaft, additional bearings beyond the opposite ends of said shaft, longitudinally movable grinding wheel spindles journaled in said last named bearings, independent clutch mechanisms for operatively connecting said spindles to said shaft, and independent means for longitudinally shifting said spindles into or out of position for connection with said shaft.

2. In a grinding and polishing machine, the combination of a constantly driven shaft, clutch mechanisms carried at each end of said shaft, bearings beyond the opposite ends of said shaft, slides mounted in said bearings, spindles journaled in said slides, adapted to carry wheels and operating handles for independently actuating said slides to move said spindles longitudinally into or out of position for engagement by said clutch mechanism of said shaft.

In witness whereof, I, hereunto subscribe my name this fourth day of April, A. D.,

WILLIAM F. OROURKE. Witnesses:

GEORG E. FOLK, MCCLELLAN YOUNG.

ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

